
			
			function chg(col){
				textarea.style.backgroundColor=col;
			}
	
			var bodyBgs = [];
        	bodyBgs[0] = "url(../images/img3.png)";
        	bodyBgs[1] = "url(../images/头1.jpg)";
        	bodyBgs[2] = "url(../images/头2.jpg)";
        	var randomBgIndex = Math.round( Math.random() * 3 );
        	var $('#cc').css('background-image',bodyBgs[randomBgIndex])
 		